Stencil duplicating machine



E. J. BRASSEUR STENCIL DUPLICATIHG MACHINE Get. 9, 1 928.

Original Filed Oct. 8, 1925 5 Sheets-Sheet 1 INVENTOR i ATTORNEY Oct. 9,1928.

E'. J. BRASSEUR STENCIL DUPLICATING MACHINE INVENTOR 13 Sheets-Sheet 2Original Filed Oct. 8, 1925 Oct. 9, 1928.

E. J. BRASSEUR STENCIL: DUPLICA'IING MACHINE Original Filed 001;. 8,1925 INVENTOR ATTORNEY Patented Oct. 9, 1928.

cnrreo "STATES PATENT Ol P'lQE.

ERNEST J. BRASSEUR, OF CEIGAGO, ILLINOIS, ASSIGNOR TO A. B. DICKCOMEANY, 0F CHIGAGO, ILLINOIS, A CULRPORATXON 0F ILLIIEI'OIS.

STENCIL DUPLICATING MACHINE.

Original application filed October B, 1925, Serial No. 61,172. Dividedand this application filed November 2, 1926.

This invention relates to stencil duplicating machines. and moreparticularly to rotary stencil duplicating machines;wherein a sheet oipaper fed into the machine is trio- 5 thinally eng ged between therotatable cylinder and a tree rubber roller so as to be drawn throughthe machine upon the rotation of the cylinder, and to rcceiye theimpression from the stencil sheet on the cylinder. The stencil sheet issupplied with printing; ink from the interior or" the cylinder, whereinis disposed an ink chamber or resewcir. In one form of constructionthere is a sealed ink chamber within the cylinder from which ink maypermeate through a diaphragm on the cylinder to an ink pad covering thediaphragm, and

l hence to the stencil sheet which is laid eye:

the pad; and there within the iul; chamber a tiltable ink trough fromwhich the operator ma y spill inh to renlenish the stencil sheet ieprinted upwardly against the inked, rotating stencil sheet to cause thestencil sheet to imprint an impression on the upper surface of thepaper. Very often, however, the cylin der is rotated without a sheetbeing interposed between the cylinder and the rubber roller, and ifduring such rotation the rub ber roller should contact the inked stencilsheet on the cylinder, this roller would receive inl'c therefrom, withthe result that the machine could not be used until this inlt has; beencompletely cleaned from the roller liltherwise paper sheets subsequentlypassed between the u' inder and roller would receive ink on their backsfrom the rubber roller, and the sheets would be spoiled.

This application is a division of an application tiled by me Uctober 8,1925, for stencil duplicating machines, Serial No. 6i,1"i'2.

in said application there disclosed, among other features, mechanismwhich positirely prevents the rubber roller from re ceivinp; ink fromthe surface ot' a stencil sheet the cylinder, and at the same timeoperatingr automatically to press each sheet of paper to be printedagainst the rotating cylinder and inked stencil sheet thereon in suchmanhber rollcr presses each paper sheet to 1161' and with such pressurethat each sheet receives the desired impression from the stencil sheet,and is positively drawn through divi- Serial No; 145,?60.

sional {"LPPllCZllllOll is directed is to the provision of means forrounding out the periphery of the printing cylinder so as to present asmooth and even cylinder surface for the rubber impression roller toroll on as the cylinder revolves in contact therewith, and at the sametime permitting the presence of means whereby the inl: pad and stencilsheet may be conveniently secured to and removed from the cylinder.

A further object of this invention is to provide improved mean forattaching the inking pad and stem sheet to the machine, which meanspermit the pad to be reversed endwise which clamp the stencil sheet tothe cylinder in such a way to relieve the strain of the stencil sheetstub agaii st the hooks there'lor; and which prevent ink from goingieyond the ends of the fabric of the ink pad and stencil; and anotherobject of this invention is to provide means of this character which aresimple, coun iact, and durable, and which are readily and y :uiljustableon and removable from the machine to permit replacement of a stencilsheet and inking pad.

Other objects of my invention will be in part obvious and in partpointed out herein after.

The invention accordingly consists in the features of construction,arrangement 0t parts and coinbinations of elements which will belescribed more fully hercinuittcr, and the scope oi the application oilwhich will be indicated in the claims that follow,

In order that a clearer understanding of my invention may be had,attention is hereby directed to the accompanyi. Q drawings forming partof this application and illustrating certain possible enilnnliments ofthis invention. Referring to the drawings, 1 a top p in View of acylinder ei'nbodying this invention, the stencil sheet mounted thereonbeing shown broken away, and the supplcn'iental tlrame plate beingabsent; Fig. 2 is a front View, partly in section, of a tragnent oi thecylinder, broken away at the center, with th, supplementalry t'raineplate in position thereon; Fig. 3 is; a frugmontary sectional Viewthereof, and is taken on the line 3-3 of F 2; 4i is a sectional View ofa fragment thereof, and is taken on the line il olt 2, the :ipplementary-frame being: shown in place on the cylinder; and 5 is a view similar toFig. 4 but showing the supplementary frame plate detached and raisedfrom the cylinder.

Similar reference characters refer to similar parts throughout theseveral views of the drawings.

Referring to the drawings, the cylinder 1n eludes two opposite sidewalls 150 and 151, having peripheral flanges 152 and 158. A sealed inkcompartment is formed within the cylinder, the compartment having sidewalls 154 and 155, flanged at 156 and 157, beneath the flanges 152 and153 of cylinder walls 150 and 151. Extending between walls 150 and 151,and embracing a major part of the circumference of the cylinder, is aperforated diaphragm 158, which has its side edges tightly securedbetween the flanges 152 and 156 on one side and between the flanges 153and on the other side. These seams or joints are leak-proof. Embracingthe remainder of the circumference of the cylinder is a plate 160, thebody of which is depressed below the surface of the cylinder. This platehas raised side flanges 161 and 162, flange 161 being secured betweenflange 156 of wall 154 and flange 152 of wall 150, and flange 162 beingsecured between flange 15'. of wall 155 and flange 153 of wall 151, thejoints being leak- )roof. 1 The ends 163 of plate 160 are curvedupwardly against the under surface of the adjacent edge portions 163' ofthe diaphragm 158 and are secured thereto along a leak proof joint. Theends of plate 163 and diaphragm 158 establish beveled surfaces or seats16l.

Plate 160 is provided with a filling opening 177 and a cap 178 therefor,to permit ink to be poured into the trough 168, suspended from thecylinder shaft 165 within the sealed ink compartment.

Behind the diaphragm 158 is a grille or grid structure 180 which aids inspreading over the diaphragm the ink spilled from trough 168.

The diaphragm 158 is covered by an ink pad, and the stencil sheet 33 islaid on this pad. The ink pad comprises a sheet of suitable fabric 182to each end of which is secured a strip of metal 183. The ink pad issecured to the cylinder by engaging the inner edge of the plates 183within the grooves 187 formed by the bent edges 1.63 of the plate 160,and moving slid-able latches 189 over the 0p posite edges of plates 183.These latch plates 189 are slidably reta ned under straps 190 secured onthe top of plate 160. Preferably the plates 183 are both alike so thatthe ink pad may be reversed, or turned over on the cylinder. By changingthe pad around from time to time its life may be extended.

Also on plate 160, near the leading edge of the diaphragm, are securedhooks or buttons 191, with which the stub 192 of stencil sheet may beengaged by placing the holes 193 in the stencil stub over the buttons.Both the ink pad and the stencil sheet lie across the beveled seats 164.

The ink pad and the stencil sheet are firmly clamped against these seatsby a metal frame having edges 1941 of complementary bevel to the seats164: and arranged to align therewith. The frame comprises an outer plate195, which rounds out the outer periphery o t the cylinder, and an innerplate 196, secured together, plate 196 having a perforation 19? to avoidinterference from filler cap 178. Toward each side edge, plate 195 isformed with a depressed portion 198 and with a raised flange, which iscurved at each end, as at 199, and has a straight portion 200intermediate these curved portions. On the underside of each straightportion 200 is a metal clamp strip 201 which has a pin extend ingthrough a slot 203 in flange 200 and there is headed over. Toward itsother end strip 201 carries a threaded pin f which penctrates a slot inflange 200 and is there ongaged by a linger nut 205, whereby the stripmay be pivotally moved toward and from flange 200. A spring 206compressed between flange 200 and strip 201 urges the strip to move awayfrom flange 200. The flanges 152 and 153 of the cylinder fills each formcurved portions 207 corresponding with flange portions 199, and with astraight portion 208 which. seats beneath that part of flange portion200 which is not occupied by clamps 201, and with a lower straightportion 209 which rests on plate 160. The frame may be secured on thecylinder by looseningscrews 205 to lower strips 201 from flanges 200,and then after placing the frame upon the cylinder, sliding the clamps201 beneath members 208. At the same time perforations 210 in flanges200 are engaged over pins 211 on cylinder flange portions 208. Now, bytightening nuts 205 the clamps 201 will he brought firmly againstportions 208 and the frame will be clamped tightly downwardly, thusclamping the beveled edges 191 tightly against the beveled edges 161 andclamping the ink pad and stencil sheet tightly therebetween. To removethis frame, it is only necessary to loosen nuts 205. slide them, withthe attached strips 201, on flanges 200 to dis engage the strips frombeneath portions 208, and then lift the frame upwardly. The removalleaves the stencil sheet and pad readily accessible for removal orreplacement, as before described.

From the above it will be readily apparent that the frame plateconstruction 195 rounds out the cylindrical periphery of the cylinderbetween the side walls thereof and between the ends of the diaphragm158. Thus. when the machine is of the type disclosed in my saidcopending application, wherein there is a rubber impression roller(shown at 10 in dot and dash lines in Fig. 1) which normal y till Ill?)contacts continuously with the cylinder as the cylinder revolves, therubber roller will have a smooth, even surface to roll on, and thestencil sheet and ink pad attaching means, and the rubber roller will beshielded from contact with each other during the operation of themachine. It also will be noted that the frame is removable andattachable very readily, thus permitting easy access to the stencilsheet and inlc pad attaching means, and to the ink port to the inkreservoir. l-ly reason of the clamping action of the frame upon the int;pad and stencil sheet the opera tor in making a replacement oradjustment of a sheet or pad need not touch any surface which is soiledwith ink, and need not soil his hands.

As many changes could be made in the above construction and as manyapparently widely different embodiments of this invention could be madewithout departing from the scope thereof, it is intended that all mattercontained in the above description or shown in the aeeom iianyingdrawings shall be interpreted as illustrative and not .in a limitingsense.

1. In an apparatus of the character described, in combination, aprinting cylinder including outside walls, interior walls, a diaphragmsecured to said interior walls in a leak-proof manner, a plate securedto said interior walls and to the ends of said diaphragm in a leak-proofmanner, and a supplementary frame covering said plate and removablysecured to said outside walls.

2. In an apparatus of the character described, in combination, aprinting cylinder including outside walls, interior walls, a diaphragmsecured to said interior walls in a leak-proof manner, a plate securedto said interior walls and to the ends of said diaphragm in a leak-proofmanner, and a supplementary frame covering said plate and removablysecured to said outside walls, said plate bemg depressed below thecircumference of the cylinder, and the outside of said frame being atthe circumference of said cylinder.

3. In an apparatus of the character described, a printing cylinderincluding, in combination, Walls, a diaphragm secured to said walls, aplate secured to said walls and to the ends of said diaphragm, and asupplementary frame covering said plate and removably secured to saidwalls, said walls having recesses and said f'ame having tongues slidablethereon into and out of engagement in said recesses, and means forsecuring said tongues tightly in said recesses to clamp said frame inplace on the cylinder.

4. In an apparatus of the character described, a printing cylinderincluding, in combination, walls, a dialiihragm secured to said walls, aplate secured to said walls and to the ends of said diaphragm, and asupplementary frame covering said plate and re mov-ably secured to saidwalls, said walls having recesses and said frame having tongues slidablethereon into and out of engagement in said recesses, and means forsecuring said tongues tightly in said recesses to-clamp said frame inplace on the cylinder, said frame and walls also having interengagingpins and apertures.

5. In an apparatus of the character described, a printing cylinderincluding, in combination, walls, a diaphragm secured to said walls, aplate secured to said walls and to the ends of said diaphragm, and asupplen'ientary frame covering said plate and removably secured to saidwalls, said walls having recesses and said frame having tongues slidablethereon into and out of engagement in said recesses, threaded pins onsaid tongues extending through said frame, and nuts on said pins,whereby said tongues may be tightly clamped upwardly against the upperwalls of said recesses.

6. I11 an apparatus of the character described, a printing cylinderincluding, in combination, walls, a diaphragnii secured to said walls, aplate secured. to said walls and to the ends of said diaphragm, and asupplementary frame covering said plate and removably secured to saidwalls, said walls having recesses and said frame having tongues slidablethereon into and out of en gagemcnt in said recesses, threaded pins onsaid tongues extending through said frame, and nuts on said pins,whereby said tongues may be tightly clamped upwardly against the upperwalls of said recesses, said nuts also constituting handles whereby saidplate may be lifted.

7. In an apparatus of the character de scribed, a printing cylinderincluding, in combination. walls, a diaphragm secured to said walls, aplate secured to said walls and to the ends of said diaphragm, and a supplementary frame covering said plate and removably secured to saidwalls, said diaphragm having beveled edges presented toward the edges ofsaid frame, and said frame having edges of complementary bevel 1 seatingon said beveled diaphragm edges.

8. In an apparatus of the character de scribed, a printing cylinderincluding, in

combination, walls, a diaphragm secured to said walls, a plate securedto said walls and.

to the ends of said diaphragm, and. a sup ple mentary frame coveringsaid plate and removahly secured to said walls, said plate edges beingflanged back whare the edges are secured to the diaphragm and forming arearwardly open recess at each said edge.

9. In an apparatus of the character described, a printing cylinderincluding, in combination, walls, a diaphragm secured to said walls, aplate secured to said walls and to the ends of said diaphragm, and asupplementary frame covering said plate and removably secured to saidwalls, said plate edgesbeing flanged back where the edges are secured tothe diaphragm and forming a rearwardly open recess at each said edge,and an ink pad on the cylinder having an attachment plate engaged alongone edge in one of said recesses.

10. In an apparatus of the character clescribed, a printing cylinderincluding, in combination, walls, adiaphragm secured to said Walls, aplate secured to said walls and to the ends of said diaphragm, and asupplementary frame covering said plate and removably secured to saidwalls, said plate edges being flanged back where the edges are securedto the diaphragm and forming a. rear- Wardly open recess at each saidedge, and an ink pad on the cylinder having at each end an attachmentplate engaged along one edge in one 0t said recesses.

11. In an apparatus of the character described, a printing cylinderincluding, in combina-tion, walls, a. diaphragm secured to said Walls, aplate secured to said ralls and to the ends of said diaphragm, and asupplementary frame covering-said plate and reinovably 5 cured to saidwalls, said plate edg s being flanged back where the ct ges thediaphragm and forming open recess at each said edge, an ink pad on thecylinder having an attachment plate engaged along one edge in one ofsaid recesses, and means on said plate engaging said attachment plate atits other edge.

12. In an apparatus of the character de scribed, a printing cylinderincluding, in combination, Walls, a diaphragm secured to said walls, aplate secured to said walls and to the ends of said diaphragm, and asupplementary frame covering said plate and reniovably secured to saidwalls, said plate edges being flanged back where the edges are securedto the diaphragm and forming rearwardly open recess at each said edge,an ink pad on the cylinder having at each end an attachment plateengaged along one edge in one of said recesses, and means on said plateengaging said attachment plates at their other edges.

13. in an apparatus of the character described, a printing cylinderincluding, in combination, walls, a diaphragm secured to said walls, aplate secured to said walls and to the ends of said diaphragm, and asupplementary frame covering said plate and. removably secured to saidwalls, said plate edges being flanged back where the edges are securedto the diaphragm and forming a rearwardly open recess at each said edge,an ink pad on the cylinder having an attachment plate engaged along oneedge in one of said recesses, and means on said plate engaging saidattachment plate at its other edge, said means including a latch barslidably mounted on said plate, and having a portion. engageable overthe edge of said plate.

14. In an apparatus of the character described, a printing cylinderincluding, in combination, walls, a diaphragm secured to said walls, aplate secured to said walls and to the ends of said diaphragm, and asupplementary frame covering said plate and re movably secured to saidvalls, said plate edges i sing flanged back where the edges are securedto the diaphragm and forming a rearwardly open recess at each said edge,an ink pad on the cylinder having at each end an attachment plateengaged along one edge in one of said recesses, and means on said plateengaging said attachment plates at their other edges, said ink pad beingreversible, end for end on said cylinder, and said means beingengageable with either attachment plate of said pad.

15. In an apparatus of the character described, a printing cylinderincluding, in combination, walls, a diaphragm secured to said walls, aplate secured to said walls and to the ends of said diaphragm, and asupplementary fame covering said plate and removably secured to saidwalls, said diaphragm having beveled edges presented toward the edges ofsaid frame, and said frame having of complementary bevel seating on saidbeveled diaphragm edges, an ink pad, and means on said plate forsecuring the ink pad to the cylinder with the fabric thereof disposedbetween said complementary beveled edges of the diaphragm and frame.

16. In an apparatus of the character described, a. printing cylinderincluding. in combination, walls, a diaphragm secured to said walls, aplate secured to said walls and to the ends of said diaphragm, asupplemeir tary frame covering said plate and rcmovably secured to saidwalls, said diaphragm having beveled edges presented toward. the edgesof said frame, said frame having edges of con'iplementary bevel seatingon said hereled diaphragm edge, a stencil sheet, and means on said platefor securing the stencil sheet to the cylinder with the fabric of thestencil sheet disposed between said complementary beveled edges ot thediaphragm and frame.

17. In an apparatus of the cliarzu-lrr described, a printing cylinderincluding. in combination, ails, a diaphragm secured to said walls, aplate secured to said walls and to the ends of said diaphragm, asupplementary frame covering said plate and removably secured to saidwalls, said diaphragm having beveled edges presented toward the edges ofsaid frame, said frame having edges of complementary bevel seating onsaid bev eled diaphragm edges, an ink pad, means on said plate forsecuring the ink pad to the ill) Ice

llll

cylinder with the fabric thereof disposed between said complementarybeveled edges of the diaphragm and frame, and means tor forcing saidcomplementary beveled edges tightly together to clamp said ink padtiabrio tightly therebetween.

18. In an apparatus of the character described, a printing cylinderincluding, in combination, Walls, a diaphragn'i secured to said Walls, aplate secured to said Walls and t0 the ends of said diaphragm, asupplemeir tary frame covering said plate and remov ably secured to saidWalls, said diaphragm having beveled edges presented toward the edges ofsaid frame, said tralne having edges of contiplementary bevel seating onsaid beveled diaphragm edges, an ink pad, means on said plate forsecuring the inlrpad to the cylinder With the fabric thereoit disposedbetween said complementary beveled edges of the diaphragm and frame, andmeans for forcing said complementary beveled edges tightly together toclamp said stencil fabric tightly therebetween.

This specification signed this 28th day of October, 1.926.

ERNEST J. BRASEdE-UE.

